We've stayed at Ft. Wilderness many times ... you have a lot of unsupervised children out and about and those buses are huge. Just like the school buses and metro buses in your hometown it is hard to see if a little one crosses in front of you.
I don't know what happened; however, it is tragic for the child's family, the bus driver, and all involved. I used to work with someone who's grandson was killed in front of the Contemporary many years ago. The whole area was subsequently redesigned.
Anyway, it's tragic.